lisp/terminal.el

   1 ;;; terminal.el --- terminal emulator for GNU Emacs.
   2
   3 ;; Copyright (C) 1986,87,88,89,93,94 Free Software Foundation, Inc.
   4
   5 ;; Author: Richard Mlynarik <mly@eddie.mit.edu>
   6 ;; Maintainer: FSF
   7 ;; Keywords: comm, terminals
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Commentary:
  27
  28 ;;; This file has been censored by the Communications Decency Act.
  29 ;;; That law was passed under the guise of a ban on pornography, but
  30 ;;; it bans far more than that.  This file did not contain pornography,
  31 ;;; but it was censored nonetheless.
  32
  33 ;;; For information on US government censorship of the Internet, and
  34 ;;; what you can do to bring back freedom of the press, see the web
  35 ;;; site http://www.vtw.org/
  36
  37 ;;; Code:
  38
  39 ;;>>TODO
  40 ;;>> ** Nothing can be done about emacs' meta-lossage **
  41 ;;>>  (without redoing keymaps `sanely' -- ask Mly for details)
  42
  43 ;;>> One probably wants to do setenv MORE -c when running with
  44 ;;>>   more-processing enabled.
  45
  46 (require 'ehelp)
  47
  48 (defgroup terminal nil
  49   "Terminal emulator for Emacs."
  50   :group 'terminals)
  51
  52
  53 (defcustom terminal-escape-char ?\C-^
  54   "*All characters except for this are passed verbatim through the
  55 terminal-emulator.  This character acts as a prefix for commands
  56 to the emulator program itself.  Type this character twice to send
  57 it through the emulator.  Type ? after typing it for a list of
  58 possible commands.
  59 This variable is local to each terminal-emulator buffer."
  60   :type 'character
  61   :group 'terminal)
  62
  63 (defcustom terminal-scrolling t ;;>> Setting this to T sort-of defeats my whole aim in writing this package...
  64   "*If non-nil, the terminal-emulator will losingly `scroll' when output occurs
  65 past the bottom of the screen.  If nil, output will win and `wrap' to the top
  66 of the screen.
  67 This variable is local to each terminal-emulator buffer."
  68   :type 'boolean
  69   :group 'terminal)
  70
  71 (defcustom terminal-more-processing t
  72   "*If non-nil, do more-processing.
  73 This variable is local to each terminal-emulator buffer."
  74   :type 'boolean
  75   :group 'terminal)
  76
  77 ;; If you are the sort of loser who uses scrolling without more breaks
  78 ;; and expects to actually see anything, you should probably set this to
  79 ;; around 400
  80 (defcustom terminal-redisplay-interval 5000
  81   "*Maximum number of characters which will be processed by the
  82 terminal-emulator before a screen redisplay is forced.
  83 Set this to a large value for greater throughput,
  84 set it smaller for more frequent updates but overall slower
  85 performance."
  86   :type 'integer
  87   :group 'terminal)
  88
  89 (defvar terminal-more-break-insertion
  90   "*** More break -- Press space to continue ***")
  91
  92 (defvar terminal-meta-map nil)
  93 (if terminal-meta-map
  94     nil
  95   (let ((map (make-sparse-keymap)))
  96     (define-key map [t] 'te-pass-through)
  97     (setq terminal-meta-map map)))
  98
  99 (defvar terminal-map nil)
 100 (if terminal-map
 101     nil
 102   (let ((map (make-sparse-keymap)))
 103     (define-key map [t] 'te-pass-through)
 104     (define-key map [switch-frame] 'handle-switch-frame)
 105     (define-key map "\e" terminal-meta-map)
 106     ;(define-key map "\C-l"
 107     ;  '(lambda () (interactive) (te-pass-through) (redraw-display)))
 108     (setq terminal-map map)))
 109
 110 (defvar terminal-escape-map nil)
 111 (if terminal-escape-map
 112     nil
 113   (let ((map (make-sparse-keymap)))
 114     (define-key map [t] 'undefined)
 115     (let ((s "0"))
 116       (while (<= (aref s 0) ?9)
 117         (define-key map s 'digit-argument)
 118         (aset s 0 (1+ (aref s 0)))))
 119     (define-key map "b" 'switch-to-buffer)
 120     (define-key map "o" 'other-window)
 121     (define-key map "e" 'te-set-escape-char)
 122     (define-key map "\C-l" 'redraw-display)
 123     (define-key map "\C-o" 'te-flush-pending-output)
 124     (define-key map "m" 'te-toggle-more-processing)
 125     (define-key map "x" 'te-escape-extended-command)
 126     ;;>> What use is this?  Why is it in the default terminal-emulator map?
 127     (define-key map "w" 'te-edit)
 128     (define-key map "?" 'te-escape-help)
 129     (define-key map (char-to-string help-char) 'te-escape-help)
 130     (setq terminal-escape-map map)))
 131
 132 (defvar te-escape-command-alist nil)
 133 (if te-escape-command-alist
 134     nil
 135   (setq te-escape-command-alist
 136         '(("Set Escape Character" . te-set-escape-char)
 137           ;;>> What use is this?  Why is it in the default terminal-emulator map?
 138           ("Edit" . te-edit)
 139           ("Refresh" . redraw-display)
 140           ("Record Output" . te-set-output-log)
 141           ("Photo" . te-set-output-log)
 142           ("Tofu" . te-tofu) ;; confuse the uninitiated
 143           ("Stuff Input" . te-stuff-string)
 144           ("Flush Pending Output" . te-flush-pending-output)
 145           ("Enable More Processing" . te-enable-more-processing)
 146           ("Disable More Processing" . te-disable-more-processing)
 147           ("Scroll at end of page" . te-do-scrolling)
 148           ("Wrap at end of page" . te-do-wrapping)
 149           ("Switch To Buffer" . switch-to-buffer)
 150           ("Other Window" . other-window)
 151           ("Kill Buffer" . kill-buffer)
 152           ("Help" . te-escape-help)
 153           ("Set Redisplay Interval" . te-set-redisplay-interval)
 154           )))
 155
 156 (defvar terminal-more-break-map nil)
 157 (if terminal-more-break-map
 158     nil
 159   (let ((map (make-sparse-keymap)))
 160     (define-key map [t] 'te-more-break-unread)
 161     (define-key map (char-to-string help-char) 'te-more-break-help)
 162     (define-key map " " 'te-more-break-resume)
 163     (define-key map "\C-l" 'redraw-display)
 164     (define-key map "\C-o" 'te-more-break-flush-pending-output)
 165     ;;>>> this isn't right
 166     ;(define-key map "\^?" 'te-more-break-flush-pending-output) ;DEL
 167     (define-key map "\r" 'te-more-break-advance-one-line)
 168
 169     (setq terminal-more-break-map map)))
 170
 171 \f
 172 ;;; Pacify the byte compiler
 173 (defvar te-process nil)
 174 (defvar te-log-buffer nil)
 175 (defvar te-height nil)
 176 (defvar te-width nil)
 177 (defvar te-more-count nil)
 178 (defvar te-redisplay-count nil)
 179 (defvar te-pending-output nil)
 180 (defvar te-saved-point)
 181 (defvar te-more-old-point nil)
 182 (defvar te-more-old-local-map nil)
 183 (defvar te-more-old-filter nil)
 184 (defvar te-more-old-mode-line-format nil)
 185 (defvar te-pending-output-info nil)
 186
 187 ;; Required to support terminfo systems
 188 (defconst te-terminal-name-prefix "emacs-em"
 189   "Prefix used for terminal type names for Terminfo.")
 190 (defconst te-terminfo-directory
 191   (file-name-as-directory
 192    (expand-file-name "emacs-terminfo" temporary-file-directory))
 193   "Directory used for run-time terminal definition files for Terminfo.")
 194 (defvar te-terminal-name nil)
 195 \f
 196 ;;;;  escape map
 197
 198 (defun te-escape ()
 199   (interactive)
 200   (let (s
 201         (local (current-local-map))
 202         (global (current-global-map)))
 203     (unwind-protect
 204         (progn
 205           (use-global-map terminal-escape-map)
 206           (use-local-map terminal-escape-map)
 207           (setq s (read-key-sequence
 208                     (if current-prefix-arg
 209                         (format "Emacs Terminal escape> %d "
 210                                 (prefix-numeric-value current-prefix-arg))
 211                         "Emacs Terminal escape> "))))
 212       (use-global-map global)
 213       (use-local-map local))
 214
 215     (message "")
 216
 217     (cond
 218      ;;  Certain keys give vector notation, like [escape] when
 219      ;;  you hit esc key...
 220      ((and (stringp s)
 221            (string= s (make-string 1 terminal-escape-char)))
 222       (setq last-command-char terminal-escape-char)
 223       (let ((terminal-escape-char -259))
 224         (te-pass-through)))
 225
 226      ((setq s (lookup-key terminal-escape-map s))
 227       (call-interactively s)))
 228
 229     ))
 230
 231
 232 (defun te-escape-help ()
 233   "Provide help on commands available after terminal-escape-char is typed."
 234   (interactive)
 235   (message "Terminal emulator escape help...")
 236   (let ((char (single-key-description terminal-escape-char)))
 237     (with-electric-help
 238       (function (lambda ()
 239          (princ (format "Terminal-emulator escape, invoked by \"%s\"
 240 Type \"%s\" twice to send a single \"%s\" through.
 241
 242 Other chars following \"%s\" are interpreted as follows:\n"
 243                         char char char char))
 244
 245          (princ (substitute-command-keys "\\{terminal-escape-map}\n"))
 246          (princ (format "\nSubcommands of \"%s\" (%s)\n"
 247                         (where-is-internal 'te-escape-extended-command
 248                                            terminal-escape-map t)
 249                         'te-escape-extended-command))
 250          (let ((l (if (fboundp 'sortcar)
 251                       (sortcar (copy-sequence te-escape-command-alist)
 252                                'string<)
 253                       (sort (copy-sequence te-escape-command-alist)
 254                             (function (lambda (a b)
 255                               (string< (car a) (car b))))))))
 256            (while l
 257              (let ((doc (or (documentation (cdr (car l)))
 258                             "Not documented")))
 259                (if (string-match "\n" doc)
 260                    ;; just use first line of documentation
 261                    (setq doc (substring doc 0 (match-beginning 0))))
 262                (princ "  \"")
 263                (princ (car (car l)))
 264                (princ "\":\n     ")
 265                (princ doc)
 266                (write-char ?\n))
 267              (setq l (cdr l))))
 268          nil)))))
 269
 270
 271
 272 (defun te-escape-extended-command ()
 273   (interactive)
 274   (let ((c (let ((completion-ignore-case t))
 275              (completing-read "terminal command: "
 276                               te-escape-command-alist
 277                               nil t))))
 278     (if c
 279         (catch 'foo
 280           (setq c (downcase c))
 281           (let ((l te-escape-command-alist))
 282             (while l
 283               (if (string= c (downcase (car (car l))))
 284                   (throw 'foo (call-interactively (cdr (car l))))
 285                 (setq l (cdr l)))))))))
 286
 287 ;; not used.
 288 (defun te-escape-extended-command-unread ()
 289   (interactive)
 290   (setq unread-command-events (listify-key-sequence (this-command-keys)))
 291   (te-escape-extended-command))
 292
 293 (defun te-set-escape-char (c)
 294   "Change the terminal-emulator escape character."
 295   (interactive "cSet escape character to: ")
 296   (let ((o terminal-escape-char))
 297     (message (if (= o c)
 298                  "\"%s\" is the escape char"
 299                  "\"%s\" is now the escape; \"%s\" passes through")
 300              (single-key-description c)
 301              (single-key-description o))
 302     (setq terminal-escape-char c)))
 303
 304
 305 (defun te-stuff-string (string)
 306   "Read a string to send to through the terminal emulator
 307 as though that string had been typed on the keyboard.
 308
 309 Very poor man's file transfer protocol."
 310   (interactive "sStuff string: ")
 311   (process-send-string te-process string))
 312
 313 (defun te-set-output-log (name)
 314   "Record output from the terminal emulator in a buffer."
 315   (interactive (list (if te-log-buffer
 316                          nil
 317                        (read-buffer "Record output in buffer: "
 318                                     (format "%s output-log"
 319                                             (buffer-name (current-buffer)))
 320                                     nil))))
 321   (if (or (null name) (equal name ""))
 322       (progn (setq te-log-buffer nil)
 323              (message "Output logging off."))
 324     (if (get-buffer name)
 325         nil
 326       (save-excursion
 327         (set-buffer (get-buffer-create name))
 328         (fundamental-mode)
 329         (buffer-disable-undo (current-buffer))
 330         (erase-buffer)))
 331     (setq te-log-buffer (get-buffer name))
 332     (message "Recording terminal emulator output into buffer \"%s\""
 333              (buffer-name te-log-buffer))))
 334
 335 (defun te-tofu ()
 336   "Discontinue output log."
 337   (interactive)
 338   (te-set-output-log nil))
 339
 340
 341 (defun te-toggle (sym arg)
 342   (set sym (cond ((not (numberp arg)) arg)
 343                  ((= arg 1) (not (symbol-value sym)))
 344                  ((< arg 0) nil)
 345                  (t t))))
 346
 347 (defun te-toggle-more-processing (arg)
 348   (interactive "p")
 349   (message (if (te-toggle 'terminal-more-processing arg)
 350                "More processing on" "More processing off"))
 351   (if terminal-more-processing (setq te-more-count -1)))
 352
 353 (defun te-toggle-scrolling (arg)
 354   (interactive "p")
 355   (message (if (te-toggle 'terminal-scrolling arg)
 356                "Scroll at end of page" "Wrap at end of page")))
 357
 358 (defun te-enable-more-processing ()
 359   "Enable ** MORE ** processing"
 360   (interactive)
 361   (te-toggle-more-processing t))
 362
 363 (defun te-disable-more-processing ()
 364   "Disable ** MORE ** processing"
 365   (interactive)
 366   (te-toggle-more-processing nil))
 367
 368 (defun te-do-scrolling ()
 369   "Scroll at end of page (yuck)"
 370   (interactive)
 371   (te-toggle-scrolling t))
 372
 373 (defun te-do-wrapping ()
 374   "Wrap to top of window at end of page"
 375   (interactive)
 376   (te-toggle-scrolling nil))
 377
 378
 379 (defun te-set-redisplay-interval (arg)
 380   "Set the maximum interval (in output characters) between screen updates.
 381 Set this number to large value for greater throughput,
 382 set it smaller for more frequent updates (but overall slower performance."
 383   (interactive "NMax number of output chars between redisplay updates: ")
 384   (setq arg (max arg 1))
 385   (setq terminal-redisplay-interval arg
 386         te-redisplay-count 0))
 387 \f
 388 ;;;; more map
 389
 390 ;; every command -must- call te-more-break-unwind
 391 ;; or grave lossage will result
 392
 393 (put 'te-more-break-unread 'suppress-keymap t)
 394 (defun te-more-break-unread ()
 395   (interactive)
 396   (if (eq last-input-char terminal-escape-char)
 397       (call-interactively 'te-escape)
 398     (message "Continuing from more break (\"%s\" typed, %d chars output pending...)"
 399              (single-key-description last-input-char)
 400              (te-pending-output-length))
 401     (setq te-more-count 259259)
 402     (te-more-break-unwind)
 403     (let ((terminal-more-processing nil))
 404       (te-pass-through))))
 405
 406 (defun te-more-break-resume ()
 407   "Proceed past the **MORE** break,
 408 allowing the next page of output to appear"
 409   (interactive)
 410   (message "Continuing from more break")
 411   (te-more-break-unwind))
 412
 413 (defun te-more-break-help ()
 414   "Provide help on commands available in a terminal-emulator **MORE** break"
 415   (interactive)
 416   (message "Terminal-emulator more break help...")
 417   (sit-for 0)
 418   (with-electric-help
 419     (function (lambda ()
 420       (princ "Terminal-emulator more break.\n\n")
 421       (princ (format "Type \"%s\" (te-more-break-resume)\n%s\n"
 422                      (where-is-internal 'te-more-break-resume
 423                                         terminal-more-break-map t)
 424                      (documentation 'te-more-break-resume)))
 425       (princ (substitute-command-keys "\\{terminal-more-break-map}\n"))
 426       (princ "Any other key is passed through to the program
 427 running under the terminal emulator and disables more processing until
 428 all pending output has been dealt with.")
 429       nil))))
 430
 431
 432 (defun te-more-break-advance-one-line ()
 433   "Allow one more line of text to be output before doing another more break."
 434   (interactive)
 435   (setq te-more-count 1)
 436   (te-more-break-unwind))
 437
 438 (defun te-more-break-flush-pending-output ()
 439   "Discard any output which has been received by the terminal emulator but
 440 not yet processed and then proceed from the more break."
 441   (interactive)
 442   (te-more-break-unwind)
 443   (te-flush-pending-output))
 444
 445 (defun te-flush-pending-output ()
 446   "Discard any as-yet-unprocessed output which has been received by
 447 the terminal emulator."
 448   (interactive)
 449   ;; this could conceivably be confusing in the presence of
 450   ;; escape-sequences spanning process-output chunks
 451   (if (null (cdr te-pending-output))
 452       (message "(There is no output pending)")
 453     (let ((length (te-pending-output-length)))
 454       (message "Flushing %d chars of pending output" length)
 455       (setq te-pending-output
 456             (list 0 (format "\n*** %d chars of pending output flushed ***\n"
 457                             length)))
 458       (te-update-pending-output-display)
 459       (te-process-output nil)
 460       (sit-for 0))))
 461
 462 \f
 463 (defun te-pass-through ()
 464   "Character is passed to the program running under the terminal emulator.
 465 One characters is treated specially:
 466 the terminal escape character (normally C-^)
 467 lets you type a terminal emulator command."
 468   (interactive)
 469   (cond ((eq last-input-char terminal-escape-char)
 470          (call-interactively 'te-escape))
 471         (t
 472          ;; Convert `return' to C-m, etc.
 473          (if (and (symbolp last-input-char)
 474                   (get last-input-char 'ascii-character))
 475              (setq last-input-char (get last-input-char 'ascii-character)))
 476          ;; Convert meta characters to 8-bit form for transmission.
 477          (if (and (integerp last-input-char)
 478                   (not (zerop (logand last-input-char ?\M-\^@))))
 479              (setq last-input-char (+ 128 (logand last-input-char 127))))
 480          ;; Now ignore all but actual characters.
 481          ;; (It ought to be possible to send through function
 482          ;; keys as character sequences if we add a description
 483          ;; to our termcap entry of what they should look like.)
 484          (if (integerp last-input-char)
 485              (progn
 486                (and terminal-more-processing (null (cdr te-pending-output))
 487                     (te-set-more-count nil))
 488                (send-string te-process (make-string 1 last-input-char))
 489                (te-process-output t))
 490            (message "Function key `%s' ignored"
 491                     (single-key-description last-input-char))))))
 492
 493
 494 (defun te-set-window-start ()
 495   (let* ((w (get-buffer-window (current-buffer)))
 496          (h (if w (window-height w))))
 497     (cond ((not w)) ; buffer not displayed
 498           ((>= h (/ (- (point) (point-min)) (1+ te-width)))
 499            ;; this is the normal case
 500            (set-window-start w (point-min)))
 501           ;; this happens if some vandal shrinks our window.
 502           ((>= h (/ (- (point-max) (point)) (1+ te-width)))
 503            (set-window-start w (- (point-max) (* h (1+ te-width)) -1)))
 504           ;; I give up.
 505           (t nil))))
 506
 507 (defun te-pending-output-length ()
 508   (let ((length (car te-pending-output))
 509         (tem (cdr te-pending-output)))
 510     (while tem
 511       (setq length (+ length (length (car tem))) tem (cdr tem)))
 512     length))
 513 \f
 514 ;;>> What use is this terminal-edit stuff anyway?
 515 ;;>>  If nothing else, it was written by somebody who didn't
 516 ;;>>  competently understand the terminal-emulator...
 517
 518 (defvar terminal-edit-map nil)
 519 (if terminal-edit-map
 520     nil
 521   (setq terminal-edit-map (make-sparse-keymap))
 522   (define-key terminal-edit-map "\C-c\C-c" 'terminal-cease-edit))
 523
 524 ;; Terminal Edit mode is suitable only for specially formatted data.
 525 (put 'terminal-edit-mode 'mode-class 'special)
 526
 527 (defun terminal-edit-mode ()
 528   "Major mode for editing the contents of a terminal-emulator buffer.
 529 The editing commands are the same as in Fundamental mode,
 530 together with a command \\<terminal-edit-map>to return to terminal emulation: \\[terminal-cease-edit]."
 531   (use-local-map terminal-edit-map)
 532   (setq major-mode 'terminal-edit-mode)
 533   (setq mode-name "Terminal Edit")
 534   (setq mode-line-modified (default-value 'mode-line-modified))
 535   (setq mode-line-process nil)
 536   (run-hooks 'terminal-edit-mode-hook))
 537
 538 (defun te-edit ()
 539   "Start editing the terminal emulator buffer with ordinary Emacs commands."
 540   (interactive)
 541   (terminal-edit-mode)
 542   (force-mode-line-update)
 543   ;; Make mode line update.
 544   (if (eq (key-binding "\C-c\C-c") 'terminal-cease-edit)
 545       (message "Editing: Type C-c C-c to return to Terminal")
 546     (message "%s"
 547              (substitute-command-keys
 548                "Editing: Type \\[terminal-cease-edit] to return to Terminal"))))
 549
 550 (defun terminal-cease-edit ()
 551   "Finish editing message; switch back to Terminal proper."
 552   (interactive)
 553
 554   ;;>> emulator will blow out if buffer isn't exactly te-width x te-height
 555   (let ((buffer-read-only nil))
 556     (widen)
 557     (let ((opoint (point-marker))
 558           (width te-width)
 559           (h (1- te-height)))
 560       (goto-char (point-min))
 561       (while (>= h 0)
 562         (let ((p (point)))
 563           (cond ((search-forward "\n" (+ p width) 'move)
 564                  (forward-char -1)
 565                  (insert-char ?\  (- width (- (point) p)))
 566                  (forward-char 1))
 567                 ((eobp)
 568                  (insert-char ?\  (- width (- (point) p))))
 569                 ((= (following-char) ?\n)
 570                  (forward-char 1))
 571                 (t
 572                  (setq p (point))
 573                  (if (search-forward "\n" nil t)
 574                      (delete-region p (1- (point)))
 575                      (delete-region p (point-max))))))
 576         (if (= h 0)
 577             (if (not (eobp)) (delete-region (point) (point-max)))
 578             (if (eobp) (insert ?\n)))
 579         (setq h (1- h)))
 580       (goto-char opoint)
 581       (set-marker opoint nil nil)
 582       (setq te-saved-point (point))
 583       (setq te-redisplay-count 0)
 584       (setq te-more-count -1)))
 585
 586   (setq mode-line-modified (default-value 'mode-line-modified))
 587   (use-local-map terminal-map)
 588   (setq major-mode 'terminal-mode)
 589   (setq mode-name "terminal")
 590   (setq mode-line-process '(":%s")))
 591 \f
 592 ;;;; more break hair
 593
 594 (defun te-more-break ()
 595   (te-set-more-count t)
 596   (make-local-variable 'te-more-old-point)
 597   (setq te-more-old-point (point))
 598   (make-local-variable 'te-more-old-local-map)
 599   (setq te-more-old-local-map (current-local-map))
 600   (use-local-map terminal-more-break-map)
 601   (make-local-variable 'te-more-old-filter)
 602   (setq te-more-old-filter (process-filter te-process))
 603   (make-local-variable 'te-more-old-mode-line-format)
 604   (setq te-more-old-mode-line-format mode-line-format
 605         mode-line-format (list "--   **MORE**  "
 606                                mode-line-buffer-identification
 607                                "%-"))
 608   (set-process-filter te-process
 609     (function (lambda (process string)
 610                 (save-excursion
 611                   (set-buffer (process-buffer process))
 612                   (setq te-pending-output (nconc te-pending-output
 613                                                  (list string))))
 614                   (te-update-pending-output-display))))
 615   (te-update-pending-output-display)
 616   (if (eq (window-buffer (selected-window)) (current-buffer))
 617       (message "More break "))
 618   (or (eobp)
 619       (null terminal-more-break-insertion)
 620       (save-excursion
 621         (forward-char 1)
 622         (delete-region (point) (+ (point) te-width))
 623         (insert terminal-more-break-insertion)))
 624   (run-hooks 'terminal-more-break-hook)
 625   (sit-for 0) ;get display to update
 626   (throw 'te-process-output t))
 627
 628 (defun te-more-break-unwind ()
 629   (use-local-map te-more-old-local-map)
 630   (set-process-filter te-process te-more-old-filter)
 631   (goto-char te-more-old-point)
 632   (setq mode-line-format te-more-old-mode-line-format)
 633   (force-mode-line-update)
 634   (let ((buffer-read-only nil))
 635     (cond ((eobp))
 636           (terminal-more-break-insertion
 637            (forward-char 1)
 638            (delete-region (point)
 639                           (+ (point) (length terminal-more-break-insertion)))
 640            (insert-char ?\  te-width)
 641            (goto-char te-more-old-point)))
 642     (setq te-more-old-point nil)
 643     (let ((te-more-count 259259))
 644       (te-newline)))
 645   ;(sit-for 0)
 646   (te-process-output t))
 647
 648 (defun te-set-more-count (newline)
 649   (let ((line (/ (- (point) (point-min)) (1+ te-width))))
 650     (if newline (setq line (1+ line)))
 651     (cond ((= line te-height)
 652            (setq te-more-count te-height))
 653           ;>>>> something is strange.  Investigate this!
 654           ((= line (1- te-height))
 655            (setq te-more-count te-height))
 656           ((or (< line (/ te-height 2))
 657                (> (- te-height line) 10))
 658            ;; break at end of this page
 659            (setq te-more-count (- te-height line)))
 660           (t
 661            ;; migrate back towards top (ie bottom) of screen.
 662            (setq te-more-count (- te-height
 663                                   (if (> te-height 10) 2 1)))))))
 664
 665 \f
 666 ;;;; More or less straight-forward terminal escapes
 667
 668 ;; ^j, meaning `newline' to non-display programs.
 669 ;; (Who would think of ever writing a system which doesn't understand
 670 ;;  display terminals natively?  Un*x:  The Operating System of the Future.)
 671 (defun te-newline ()
 672   "Move down a line, optionally do more processing, perhaps wrap/scroll,
 673 move to start of new line, clear to end of line."
 674   (end-of-line)
 675   (cond ((not terminal-more-processing))
 676         ((< (setq te-more-count (1- te-more-count)) 0)
 677          (te-set-more-count t))
 678         ((eq te-more-count 0)
 679          ;; this doesn't return
 680          (te-more-break)))
 681   (if (eobp)
 682       (progn
 683         (delete-region (point-min) (+ (point-min) te-width))
 684         (goto-char (point-min))
 685         (if terminal-scrolling
 686             (progn (delete-char 1)
 687                    (goto-char (point-max))
 688                    (insert ?\n))))
 689     (forward-char 1)
 690     (delete-region (point) (+ (point) te-width)))
 691   (insert-char ?\  te-width)
 692   (beginning-of-line)
 693   (te-set-window-start))
 694
 695 ; ^p = x+32 y+32
 696 (defun te-move-to-position ()
 697   ;; must offset by #o40 since cretinous unix won't send a 004 char through
 698   (let ((y (- (te-get-char) 32))
 699         (x (- (te-get-char) 32)))
 700     (if (or (> x te-width)
 701             (> y te-height))
 702         ()
 703       (goto-char (+ (point-min) x (* y (1+ te-width))))
 704       ;(te-set-window-start?)
 705       ))
 706   (setq te-more-count -1))
 707
 708
 709
 710 ;; ^p c
 711 (defun te-clear-rest-of-line ()
 712   (save-excursion
 713     (let ((n (- (point) (progn (end-of-line) (point)))))
 714       (delete-region (point) (+ (point) n))
 715       (insert-char ?\  (- n)))))
 716
 717
 718 ;; ^p C
 719 (defun te-clear-rest-of-screen ()
 720   (save-excursion
 721     (te-clear-rest-of-line)
 722     (while (progn (end-of-line) (not (eobp)))
 723       (forward-char 1) (end-of-line)
 724       (delete-region (- (point) te-width) (point))
 725       (insert-char ?\  te-width))))
 726
 727
 728 ;; ^p ^l
 729 (defun te-clear-screen ()
 730   ;; regenerate buffer to compensate for (nonexistent!!) bugs.
 731   (erase-buffer)
 732   (let ((i 0))
 733     (while (< i te-height)
 734       (setq i (1+ i))
 735       (insert-char ?\  te-width)
 736       (insert ?\n)))
 737   (delete-region (1- (point-max)) (point-max))
 738   (goto-char (point-min))
 739   (setq te-more-count -1))
 740
 741
 742 ;; ^p ^o count+32
 743 (defun te-insert-lines ()
 744   (if (not (bolp))
 745       ();(error "fooI")
 746     (save-excursion
 747       (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 748              (n (min (- (te-get-char) ?\ ) line))
 749              (i 0))
 750         (delete-region (- (point-max) (* n (1+ te-width))) (point-max))
 751         (if (eq (point) (point-max)) (insert ?\n))
 752         (while (< i n)
 753           (setq i (1+ i))
 754           (insert-char ?\  te-width)
 755           (or (eq i line) (insert ?\n))))))
 756   (setq te-more-count -1))
 757
 758
 759 ;; ^p ^k count+32
 760 (defun te-delete-lines ()
 761   (if (not (bolp))
 762       ();(error "fooD")
 763     (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 764            (n (min (- (te-get-char) ?\ ) line))
 765            (i 0))
 766       (delete-region (point)
 767                      (min (+ (point) (* n (1+ te-width))) (point-max)))
 768       (save-excursion
 769         (goto-char (point-max))
 770         (while (< i n)
 771           (setq i (1+ i))
 772           (insert-char ?\  te-width)
 773           (or (eq i line) (insert ?\n))))))
 774   (setq te-more-count -1))
 775
 776 ;; ^p ^a
 777 (defun te-beginning-of-line ()
 778   (beginning-of-line))
 779
 780 ;; ^p ^b
 781 (defun te-backward-char ()
 782   (if (not (bolp))
 783       (backward-char 1)))
 784
 785 ;; ^p ^f
 786 (defun te-forward-char ()
 787   (if (not (eolp))
 788       (forward-char 1)))
 789
 790 \f
 791 ;; 0177
 792 (defun te-delete ()
 793   (if (bolp)
 794       ()
 795     (delete-region (1- (point)) (point))
 796     (insert ?\ )
 797     (forward-char -1)))
 798
 799 ;; ^p ^g
 800 (defun te-beep ()
 801   (beep))
 802
 803
 804 ;; ^p _ count+32
 805 (defun te-insert-spaces ()
 806   (let* ((p (point))
 807          (n (min (- (te-get-char) 32)
 808                  (- (progn (end-of-line) (point)) p))))
 809     (if (<= n 0)
 810         nil
 811       (delete-char (- n))
 812       (goto-char p)
 813       (insert-char ?\  n))
 814     (goto-char p)))
 815
 816 ;; ^p d count+32  (should be ^p ^d but cretinous un*x won't send ^d chars!!!)
 817 (defun te-delete-char ()
 818   (let* ((p (point))
 819          (n (min (- (te-get-char) 32)
 820                  (- (progn (end-of-line) (point)) p))))
 821     (if (<= n 0)
 822         nil
 823       (insert-char ?\  n)
 824       (goto-char p)
 825       (delete-char n))
 826     (goto-char p)))
 827
 828
 829 \f
 830 ;; disgusting unix-required excrement
 831 ;;  Are we living twenty years in the past yet?
 832
 833 (defun te-losing-unix ()
 834   nil)
 835
 836 ;; ^i
 837 (defun te-output-tab ()
 838   (let* ((p (point))
 839          (x (- p (progn (beginning-of-line) (point))))
 840          (l (min (- 8 (logand x 7))
 841                  (progn (end-of-line) (- (point) p)))))
 842     (goto-char (+ p l))))
 843
 844 ;; ^p ^j
 845 ;; Handle the `do' or `nl' termcap capability.
 846 ;;>> I am not sure why this broken, obsolete, capability is here.
 847 ;;>> Perhaps it is for VIle.  No comment was made about why it
 848 ;;>> was added (in "Sun Dec  6 01:22:27 1987  Richard Stallman")
 849 (defun te-down-vertically-or-scroll ()
 850   "Move down a line vertically, or scroll at bottom."
 851   (let ((column (current-column)))
 852     (end-of-line)
 853     (if (eobp)
 854         (progn
 855           (delete-region (point-min) (+ (point-min) te-width))
 856           (goto-char (point-min))
 857           (delete-char 1)
 858           (goto-char (point-max))
 859           (insert ?\n)
 860           (insert-char ?\  te-width)
 861           (beginning-of-line))
 862       (forward-line 1))
 863     (move-to-column column))
 864   (te-set-window-start))
 865
 866 ;; Also:
 867 ;;  ^m => beginning-of-line (for which it -should- be using ^p ^a, right?!!)
 868 ;;  ^g => te-beep (for which it should use ^p ^g)
 869 ;;  ^h => te-backward-char (for which it should use ^p ^b)
 870
 871 \f
 872
 873 (defun te-filter (process string)
 874   (let* ((obuf (current-buffer)))
 875     ;; can't use save-excursion, as that preserves point, which we don't want
 876     (unwind-protect
 877         (progn
 878           (set-buffer (process-buffer process))
 879           (goto-char te-saved-point)
 880           (and (bufferp te-log-buffer)
 881                (if (null (buffer-name te-log-buffer))
 882                    ;; killed
 883                    (setq te-log-buffer nil)
 884                  (set-buffer te-log-buffer)
 885                  (goto-char (point-max))
 886                  (insert-before-markers string)
 887                  (set-buffer (process-buffer process))))
 888           (setq te-pending-output (nconc te-pending-output (list string)))
 889           (te-update-pending-output-display)
 890           (te-process-output (eq (current-buffer)
 891                                  (window-buffer (selected-window))))
 892           (set-buffer (process-buffer process))
 893           (setq te-saved-point (point)))
 894       (set-buffer obuf))))
 895
 896 ;; (A version of the following comment which might be distractingly offensive
 897 ;; to some readers has been moved to term-nasty.el.)
 898 ;; unix lacks ITS-style tty control...
 899 (defun te-process-output (preemptible)
 900   ;;>> There seems no good reason to ever disallow preemption
 901   (setq preemptible t)
 902   (catch 'te-process-output
 903     (let ((buffer-read-only nil)
 904           (string nil) ostring start char (matchpos nil))
 905       (while (cdr te-pending-output)
 906         (setq ostring string
 907               start (car te-pending-output)
 908               string (car (cdr te-pending-output))
 909               char (aref string start))
 910         (if (eq (setq start (1+ start)) (length string))
 911             (progn (setq te-pending-output
 912                            (cons 0 (cdr (cdr te-pending-output)))
 913                          start 0
 914                          string (car (cdr te-pending-output)))
 915                    (te-update-pending-output-display))
 916             (setcar te-pending-output start))
 917         (if (and (> char ?\037) (< char ?\377))
 918             (cond ((eolp)
 919                    ;; unread char
 920                    (if (eq start 0)
 921                        (setq te-pending-output
 922                              (cons 0 (cons (make-string 1 char)
 923                                            (cdr te-pending-output))))
 924                        (setcar te-pending-output (1- start)))
 925                    (te-newline))
 926                   ((null string)
 927                    (delete-char 1) (insert char)
 928                    (te-redisplay-if-necessary 1))
 929                   (t
 930                    (let ((end (or (and (eq ostring string) matchpos)
 931                                   (setq matchpos (string-match
 932                                                    "[\000-\037\177-\377]"
 933                                                    string start))
 934                                   (length string))))
 935                      (delete-char 1) (insert char)
 936                      (setq char (point)) (end-of-line)
 937                      (setq end (min end (+ start (- (point) char))))
 938                      (goto-char char)
 939                      (if (eq end matchpos) (setq matchpos nil))
 940                      (delete-region (point) (+ (point) (- end start)))
 941                      (insert (if (and (eq start 0)
 942                                       (eq end (length string)))
 943                                  string
 944                                  (substring string start end)))
 945                      (if (eq end (length string))
 946                          (setq te-pending-output
 947                                (cons 0 (cdr (cdr te-pending-output))))
 948                          (setcar te-pending-output end))
 949                      (te-redisplay-if-necessary (1+ (- end start))))))
 950           ;; I suppose if I split the guts of this out into a separate
 951           ;;  function we could trivially emulate different terminals
 952           ;; Who cares in any case?  (Apart from stupid losers using rlogin)
 953           (funcall
 954             (if (eq char ?\^p)
 955                 (or (cdr (assq (te-get-char)
 956                                '((?= . te-move-to-position)
 957                                  (?c . te-clear-rest-of-line)
 958                                  (?C . te-clear-rest-of-screen)
 959                                  (?\C-o . te-insert-lines)
 960                                  (?\C-k . te-delete-lines)
 961                                  ;; not necessary, but help sometimes.
 962                                  (?\C-a . te-beginning-of-line)
 963                                  (?\C-b . te-backward-char)
 964                                  ;; should be C-d, but un*x
 965                                  ;;  pty's won't send \004 through!
 966                                  ;; Can you believe this?
 967                                  (?d . te-delete-char)
 968                                  (?_ . te-insert-spaces)
 969                                  ;; random
 970                                  (?\C-f . te-forward-char)
 971                                  (?\C-g . te-beep)
 972                                  (?\C-j . te-down-vertically-or-scroll)
 973                                  (?\C-l . te-clear-screen)
 974                                  )))
 975                     'te-losing-unix)
 976                 (or (cdr (assq char
 977                                '((?\C-j . te-newline)
 978                                  (?\177 . te-delete)
 979                                  ;; Did I ask to be sent these characters?
 980                                  ;; I don't remember doing so, either.
 981                                  ;; (Perhaps some operating system or
 982                                  ;; other is completely incompetent...)
 983                                  (?\C-m . te-beginning-of-line)
 984                                  (?\C-g . te-beep)
 985                                  (?\C-h . te-backward-char)
 986                                  (?\C-i . te-output-tab))))
 987                     'te-losing-unix)))
 988           (te-redisplay-if-necessary 1))
 989         (and preemptible
 990              (input-pending-p)
 991              ;; preemptible output!  Oh my!!
 992              (throw 'te-process-output t)))))
 993   ;; We must update window-point in every window displaying our buffer
 994   (walk-windows (lambda (w)
 995                   (when (and (not (eq w (selected-window)))
 996                              (eq (window-buffer w) (current-buffer)))
 997                     (set-window-point w (point))))))
 998
 999 (defun te-get-char ()
1000   (if (cdr te-pending-output)
1001       (let ((start (car te-pending-output))
1002             (string (car (cdr te-pending-output))))
1003         (prog1 (aref string start)
1004           (if (eq (setq start (1+ start)) (length string))
1005               (setq te-pending-output (cons 0 (cdr (cdr te-pending-output))))
1006               (setcar te-pending-output start))))
1007     (catch 'char
1008       (let ((filter (process-filter te-process)))
1009         (unwind-protect
1010             (progn
1011               (set-process-filter te-process
1012                                   (function (lambda (p s)
1013                                     (or (eq (length s) 1)
1014                                         (setq te-pending-output (list 1 s)))
1015                                     (throw 'char (aref s 0)))))
1016               (accept-process-output te-process))
1017           (set-process-filter te-process filter))))))
1018
1019
1020 (defun te-redisplay-if-necessary (length)
1021   (and (<= (setq te-redisplay-count (- te-redisplay-count length)) 0)
1022        (eq (current-buffer) (window-buffer (selected-window)))
1023        (waiting-for-user-input-p)
1024        (progn (te-update-pending-output-display)
1025               (sit-for 0)
1026               (setq te-redisplay-count terminal-redisplay-interval))))
1027
1028 (defun te-update-pending-output-display ()
1029   (if (null (cdr te-pending-output))
1030       (setq te-pending-output-info "")
1031     (let ((length (te-pending-output-length)))
1032       (if (< length 1500)
1033           (setq te-pending-output-info "")
1034         (setq te-pending-output-info (format "(%dK chars output pending) "
1035                                              (/ (+ length 512) 1024))))))
1036   (force-mode-line-update))
1037
1038 \f
1039 (defun te-sentinel (process message)
1040   (cond ((eq (process-status process) 'run))
1041         ((null (buffer-name (process-buffer process)))) ;deleted
1042         (t (let ((b (current-buffer)))
1043              (save-excursion
1044                (set-buffer (process-buffer process))
1045                (setq buffer-read-only nil)
1046                (fundamental-mode)
1047                (goto-char (point-max))
1048                (delete-blank-lines)
1049                (delete-horizontal-space)
1050                (insert "\n*******\n" message "*******\n"))
1051              (if (and (eq b (process-buffer process))
1052                       (waiting-for-user-input-p))
1053                  (progn (goto-char (point-max))
1054                         (recenter -1)))))))
1055 \f
1056 (defvar te-stty-string "stty -nl erase '^?' kill '^u' intr '^c' echo pass8"
1057   "Shell command to set terminal modes for terminal emulator.")
1058 ;; This used to have `new' in it, but that loses outside BSD
1059 ;; and it's apparently not needed in BSD.
1060
1061 (defcustom explicit-shell-file-name nil
1062   "*If non-nil, is file name to use for explicitly requested inferior shell."
1063   :type '(choice (const :tag "None" nil)
1064                  file)
1065   :group 'terminal)
1066
1067 ;;;###autoload
1068 (defun terminal-emulator (buffer program args &optional width height)
1069   "Under a display-terminal emulator in BUFFER, run PROGRAM on arguments ARGS.
1070 ARGS is a list of argument-strings.  Remaining arguments are WIDTH and HEIGHT.
1071 BUFFER's contents are made an image of the display generated by that program,
1072 and any input typed when BUFFER is the current Emacs buffer is sent to that
1073 program as keyboard input.
1074
1075 Interactively, BUFFER defaults to \"*terminal*\" and PROGRAM and ARGS
1076 are parsed from an input-string using your usual shell.
1077 WIDTH and HEIGHT are determined from the size of the current window
1078 -- WIDTH will be one less than the window's width, HEIGHT will be its height.
1079
1080 To switch buffers and leave the emulator, or to give commands
1081 to the emulator itself (as opposed to the program running under it),
1082 type Control-^.  The following character is an emulator command.
1083 Type Control-^ twice to send it to the subprogram.
1084 This escape character may be changed using the variable `terminal-escape-char'.
1085
1086 `Meta' characters may not currently be sent through the terminal emulator.
1087
1088 Here is a list of some of the variables which control the behaviour
1089 of the emulator -- see their documentation for more information:
1090 terminal-escape-char, terminal-scrolling, terminal-more-processing,
1091 terminal-redisplay-interval.
1092
1093 This function calls the value of terminal-mode-hook if that exists
1094 and is non-nil after the terminal buffer has been set up and the
1095 subprocess started."
1096   (interactive
1097     (cons (save-excursion
1098             (set-buffer (get-buffer-create "*terminal*"))
1099             (buffer-name (if (or (not (boundp 'te-process))
1100                                  (null te-process)
1101                                  (not (eq (process-status te-process)
1102                                           'run)))
1103                              (current-buffer)
1104                            (generate-new-buffer "*terminal*"))))
1105           (append
1106             (let* ((default-s
1107                      ;; Default shell is same thing M-x shell uses.
1108                      (or explicit-shell-file-name
1109                          (getenv "ESHELL")
1110                          (getenv "SHELL")
1111                          "/bin/sh"))
1112                    (s (read-string
1113                        (format "Run program in emulator: (default %s) "
1114                                default-s))))
1115               (if (equal s "")
1116                   (list default-s '())
1117                 (te-parse-program-and-args s))))))
1118   (switch-to-buffer buffer)
1119   (if (null width) (setq width (- (window-width (selected-window)) 1)))
1120   (if (null height) (setq height (- (window-height (selected-window)) 1)))
1121   (terminal-mode)
1122   (setq te-width width te-height height)
1123   (setq te-terminal-name (concat te-terminal-name-prefix
1124                                  (number-to-string te-width)
1125                                  (number-to-string te-height)))
1126   (setq mode-line-buffer-identification
1127         (list (format "Emacs terminal %dx%d: %%b  " te-width te-height)
1128               'te-pending-output-info))
1129   (let ((buffer-read-only nil))
1130     (te-clear-screen))
1131   (let (process)
1132     (while (setq process (get-buffer-process (current-buffer)))
1133       (if (y-or-n-p (format "Kill process %s? " (process-name process)))
1134           (delete-process process)
1135         (error "Process %s not killed" (process-name process)))))
1136   (condition-case err
1137       (let ((process-environment
1138              (cons (concat "TERM=" te-terminal-name)
1139                    (cons (concat "TERMCAP=" (te-create-termcap))
1140                          (cons (concat "TERMINFO=" (te-create-terminfo))
1141                                process-environment)))))
1142         (setq te-process
1143               (start-process "terminal-emulator" (current-buffer)
1144                              "/bin/sh" "-c"
1145                              ;; Yuck!!! Start a shell to set some terminal
1146                              ;; control characteristics.  Then start the
1147                              ;; "env" program to setup the terminal type
1148                              ;; Then finally start the program we wanted.
1149                              (format "%s; exec %s"
1150                                      te-stty-string
1151                                      (mapconcat 'te-quote-arg-for-sh
1152                                                 (cons program args) " "))))
1153         (set-process-filter te-process 'te-filter)
1154         (set-process-sentinel te-process 'te-sentinel))
1155     (error (fundamental-mode)
1156            (signal (car err) (cdr err))))
1157   (setq inhibit-quit t)                 ;sport death
1158   (use-local-map terminal-map)
1159   (run-hooks 'terminal-mode-hook)
1160   (message "Entering emacs terminal-emulator...  Type %s %s for help"
1161            (single-key-description terminal-escape-char)
1162            (mapconcat 'single-key-description
1163                       (where-is-internal 'te-escape-help terminal-escape-map t)
1164                       " ")))
1165
1166
1167 (defun te-parse-program-and-args (s)
1168   (cond ((string-match "\\`\\([-a-zA-Z0-9+=_.@/:]+[ \t]*\\)+\\'" s)
1169          (let ((l ()) (p 0))
1170            (while p
1171              (setq l (cons (if (string-match
1172                                 "\\([-a-zA-Z0-9+=_.@/:]+\\)\\([ \t]+\\)*"
1173                                 s p)
1174                                (prog1 (substring s p (match-end 1))
1175                                  (setq p (match-end 0))
1176                                  (if (eq p (length s)) (setq p nil)))
1177                                (prog1 (substring s p)
1178                                  (setq p nil)))
1179                            l)))
1180            (setq l (nreverse l))
1181            (list (car l) (cdr l))))
1182         ((and (string-match "[ \t]" s) (not (file-exists-p s)))
1183          (list shell-file-name (list "-c" (concat "exec " s))))
1184         (t (list s ()))))
1185
1186 (put 'terminal-mode 'mode-class 'special)
1187 ;; This is only separated out from function terminal-emulator
1188 ;; to keep the latter a little more manageable.
1189 (defun terminal-mode ()
1190   "Set up variables for use with the terminal-emulator.
1191 One should not call this -- it is an internal function
1192 of the terminal-emulator"
1193   (kill-all-local-variables)
1194   (buffer-disable-undo (current-buffer))
1195   (setq major-mode 'terminal-mode)
1196   (setq mode-name "terminal")
1197 ; (make-local-variable 'Helper-return-blurb)
1198 ; (setq Helper-return-blurb "return to terminal simulator")
1199   (setq mode-line-process '(":%s"))
1200   (setq buffer-read-only t)
1201   (setq truncate-lines t)
1202   (make-local-variable 'terminal-escape-char)
1203   (setq terminal-escape-char (default-value 'terminal-escape-char))
1204   (make-local-variable 'terminal-scrolling)
1205   (setq terminal-scrolling (default-value 'terminal-scrolling))
1206   (make-local-variable 'terminal-more-processing)
1207   (setq terminal-more-processing (default-value 'terminal-more-processing))
1208   (make-local-variable 'terminal-redisplay-interval)
1209   (setq terminal-redisplay-interval (default-value 'terminal-redisplay-interval))
1210   (make-local-variable 'te-width)
1211   (make-local-variable 'te-height)
1212   (make-local-variable 'te-process)
1213   (make-local-variable 'te-pending-output)
1214   (setq te-pending-output (list 0))
1215   (make-local-variable 'te-saved-point)
1216   (setq te-saved-point (point-min))
1217   (make-local-variable 'te-pending-output-info) ;for the mode line
1218   (setq te-pending-output-info "")
1219   (make-local-variable 'inhibit-quit)
1220   ;(setq inhibit-quit t)
1221   (make-local-variable 'te-log-buffer)
1222   (setq te-log-buffer nil)
1223   (make-local-variable 'te-more-count)
1224   (setq te-more-count -1)
1225   (make-local-variable 'te-redisplay-count)
1226   (setq te-redisplay-count terminal-redisplay-interval)
1227   ;(use-local-map terminal-mode-map)
1228   ;; terminal-mode-hook is called above in function terminal-emulator
1229   )
1230 \f
1231 ;;;; what a complete loss
1232
1233 (defun te-quote-arg-for-sh (string)
1234   (cond ((string-match "\\`[-a-zA-Z0-9+=_.@/:]+\\'"
1235                        string)
1236          string)
1237         ((not (string-match "[$]" string))
1238          ;; "[\"\\]" are special to sh and the lisp reader in the same way
1239          (prin1-to-string string))
1240         (t
1241          (let ((harder "")
1242                (start 0)
1243                (end 0))
1244            (while (cond ((>= start (length string))
1245                          nil)
1246                         ;; this is the set of chars magic with "..." in `sh'
1247                         ((setq end (string-match "[\"\\$]"
1248                                                  string start))
1249                          t)
1250                         (t (setq harder (concat harder
1251                                                 (substring string start)))
1252                            nil))
1253              (setq harder (concat harder (substring string start end)
1254                                   ;; Can't use ?\\ since `concat'
1255                                   ;; unfortunately does prin1-to-string
1256                                   ;; on fixna.  Amazing.
1257                                   "\\"
1258                                   (substring string
1259                                              end
1260                                              (1+ end)))
1261                    start (1+ end)))
1262            (concat "\"" harder "\"")))))
1263
1264 (defun te-create-terminfo ()
1265   "Create and compile a terminfo entry for the virtual terminal. This is kept
1266 in the directory specified by `te-terminfo-directory'."
1267   (if (and system-uses-terminfo
1268            (not (file-exists-p (concat  te-terminfo-directory
1269                                         (substring te-terminal-name-prefix 0 1)
1270                                         "/" te-terminal-name))))
1271     (let ( (terminfo
1272             (concat
1273              ;; The first newline avoids trouble with ncurses.
1274              (format "%s,\n\tmir, xon,cols#%d, lines#%d,"
1275                      te-terminal-name te-width te-height)
1276              "bel=^P^G, clear=^P\\f, cr=^P^A, cub1=^P^B, cud1=^P\\n,"
1277              "cuf1=^P^F, cup=^P=%p1%'\\s'%+%c%p2%'\\s'%+%c,"
1278              "dch=^Pd%p1%'\\s'%+%c, dch1=^Pd!, dl=^P^K%p1%'\\s'%+%c,"
1279              "dl1=^P^K!, ed=^PC, el=^Pc, home=^P=\\s\\s,"
1280              "ich=^P_%p1%'\\s'%+%c, ich1=^P_!, il=^P^O%p1%'\\s'%+%c,"
1281              "il1=^P^O!, ind=^P\\n, nel=\\n,\n"))
1282            ;; The last newline avoids trouble with ncurses.
1283            (file-name (concat te-terminfo-directory te-terminal-name ".tif")) )
1284       (make-directory te-terminfo-directory t)
1285       (save-excursion
1286         (set-buffer (create-file-buffer file-name))
1287         (insert terminfo)
1288         (write-file file-name)
1289         (kill-buffer nil)
1290         )
1291       (let ( (process-environment
1292               (cons (concat "TERMINFO="
1293                             (directory-file-name te-terminfo-directory))
1294                     process-environment)) )
1295         (set-process-sentinel (start-process "tic" nil "tic" file-name)
1296                               'te-tic-sentinel))))
1297     (directory-file-name te-terminfo-directory)
1298 )
1299
1300 (defun te-create-termcap ()
1301   "Create a termcap entry for the virtual terminal"
1302   ;; Because of Unix Brain Death(tm), we can't change
1303   ;;  the terminal type of a running process, and so
1304   ;;  terminal size and scrollability are wired-down
1305   ;;  at this point.  ("Detach?  What's that?")
1306   (concat (format "%s:co#%d:li#%d:%s"
1307                   ;; Sigh.  These can't be dynamically changed.
1308                   te-terminal-name te-width te-height (if terminal-scrolling
1309                                          "" "ns:"))
1310           ;;-- Basic things
1311           ;; cursor-motion, bol, forward/backward char
1312           "cm=^p=%+ %+ :cr=^p^a:le=^p^b:nd=^p^f:"
1313           ;; newline, clear eof/eof, audible bell
1314           "nw=^j:ce=^pc:cd=^pC:cl=^p^l:bl=^p^g:"
1315           ;; insert/delete char/line
1316           "IC=^p_%+ :DC=^pd%+ :AL=^p^o%+ :DL=^p^k%+ :"
1317           ;;-- Not-widely-known (ie nonstandard) flags, which mean
1318           ;; o writing in the last column of the last line
1319           ;;   doesn't cause idiotic scrolling, and
1320           ;; o don't use idiotische c-s/c-q sogenannte
1321           ;;   ``flow control'' auf keinen Fall.
1322           "LP:NF:"
1323           ;;-- For stupid or obsolete programs
1324           "ic=^p_!:dc=^pd!:al=^p^o!:dl=^p^k!:ho=^p=  :"
1325           ;;-- For disgusting programs.
1326           ;; (VI? What losers need these, I wonder?)
1327           "im=:ei=:dm=:ed=:mi:do=^p^j:nl=^p^j:bs:")
1328 )
1329
1330 (defun te-tic-sentinel (proc state-change)
1331   "If tic has finished, delete the .tif file"
1332   (if (equal state-change "finished
1333 ")
1334       (delete-file (concat te-terminfo-directory te-terminal-name ".tif"))))
1335
1336 (provide 'terminal)
1337
1338 ;;; terminal.el ends here